The stock tune initiates a dpf regeneration at 65% soot loading behind the scenes and you are not aware it is on. If the regen does not occur due to operating conditions, the soot will build up to 80%, 90% and up to 100%. At these levels, the stock tune will display a message on the dash to get on the highway and perform a regen.

With GDE "Regen Message", we will activate the "regen in progress" message on the center display any time an active regen is happening. In this manner, you are aware of every regen and when they are occurring. If you want to be aware of this, then the feature is very nice. Some folks do not want to turn off the engine during an active regen just to prevent heat soak on all the components as the exhaust will be at about 1250F for 10 minutes during regens.